eca_base: Let eca_token_set_value support a YAML-formatted nested array

Issue information

From user: mxh

Related to !135 (merged)

Contribution record

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Problem/Motivation

We have a need for setting a nested Token value, which is basically just an array / object. Otherwise we'd need to set every single property with one action for each.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

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